Reproduction steps:
1. Open the user’s attached project “TestOptimizeMeshData”
2. Click Build > Clear Build Cache > All in the Addressables Groups window
3. Click Build > New Build > Default Build Script in the Addressables Groups window
4. Use WebExtract on a bundle called “defaultlocalgroup_assets_m_sc_chiji02_shitou01…” in the folder containing the built bundles (for example “\Library\com.unity.addressables\aa\Windows\StandaloneWindows64\”)
5. Use binary2text on the generated file called “CAB-…”
6. Open the generated text file

Expected result: The size of m_VertexData is 12824 bytes
Actual result: The size is 9160 bytes

Reproducible with: 1.20.3 (2020.3.40f1, 2021.3.11f1), 1.20.5 (2022.1.18f1, 2022.2.0b9, 2023.1.0a12)

Reproducible on: Windows 11

Note: On 2022.2.0b9 and 2023.1.0a12 the expected size is 13048 and the actual size is 9320